Apparatus for conducting and screening gases from metallurgical furnaces



(No Model.)

M. W. ILES.. APPARATUS FOR CONDUCTING AND SGREBNING GASES FROMMETALLURGICAL FURNAGES.

Patented May 31, 1892.

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'ATENT OFFICE.

MALVERN \V. ILES, OF DENVER, COLORADO.

APPARATUS FOR CONDUCTING AND SCREENING GASES FROM METALLURGICALFURNACES.

SPECIFICATION forming part of Letters Patent No. 475,774, dated May 31,1892.. Application filed March 22, 1892. Serial No. 425,971- (No model)To aZZ whom it may concern.-

Be it known that I, MALVERN W. ILES, of the city of Denver, county ofArapahoe, and State of Colorado, have in vented a certain new and usefulImprovement in A pparatusforOonducting and Screening Gases fromMetallurgical Furnaces, of which the following is a true and exactdescription, reference being had to the accom panyin gdrawin gs, whichform a part of this specification.

Myinvention relates to the devices or structures used for conducting thegases, fumes, &c., driven off from metallurgical furnaces, especiallysmelters, to a screening-chamber or bag-honse, as it is generallycalled, in which the final separation of the gaseous and solid particlesis effected. In structures of this kind the mains or conduits throughwhich the gases, &c., pass from the furnace to the bag-house arenecessarily made of considerable length, and as far as practicable theyare made of sheet metal and situated in the open air so as to cool thegases and insure that when they reach the bag-house they will not be hotenough to destroy the fabric, screens, or bags situated therein. Aconsiderable quantity of metallic fumes and other solid particles isdeposited in the main delivery-pipe, and provision must be made toenable this depositto be removed from time to time, and it has beencustomary to form hoppers in the bottom of the elevated main, doors inthe bottom of which are opened from time to time to permit the dust anddeposited fume to escape. This hopper system has some drawbacks, amongwhich may be noted that it is difficult to avoid loss in emptying thehopv pers; also that the hoppers cannot be opened while the gases, &c.,are passing through the main without permitting their escape; nor do thehoppers obviate the danger of fire in the main, which is one of the mostserious and troublesome difficulties met with in using the system.

To overcome the difficulties incident to the use of metallic hoppers Ihave devised an arrangement by which in place of hoppers metal thimblesare secured around the openings in the bottom of the maimand to thesethimbles are secured the open ends of depending bags of strong fabric,the lower ends of which can be opened or closed at will.

Reference being now had to the drawings in which my invention isillustrated, Figure 1 is a sectional elevation of the bag-house and ofthe main connecting therewith; Fig. 2, a side elevation of a portion ofthe main provided with my improvement, taken on the line 1 2 of Fig. 1;Fig. 3, a cross-section of the main on the line 3 4 of Fig. 2. Fig. 4 isa section on the line 5 6 of Fig. 3, and Fig. 5 a perspective viewshowing the device used for closing and opening the ends of the bags.

A is the bag-house, consisting of a bag-room O, situated above afume-chamber D and separated therefrom by a floor or partition D.

B 1-3, &e., are bags suspended in the chamher 0 and connected at theirbottoms with openings, (indicated at (Z in the floor D.)

d d are doors leading into the fume-chamber D.

(Z is a short pipe or thimble leading out of the chamber D. To thisthimble d" a pipe connection E is united, leading to a thimble F,leading out of the portion G of the main which runs along the bag-house.The continuation of this main leading toward the furnace (not shown) isindicated at H in Fig. 2. The main, it will be observed, is supported byangle-irons I at a considerable distance above the ground. At intervalsalong the bottom of the main are formed openings around which aresecured thimbles J, and to these thimbles are secured the strong fabricbags K K, 850., a strap L being conveniently used, as shown, to securethe tops of the bags and thimbles together. On each side of the openbottoms K of the bags is secured a bar M, and by clamping these two barsM M together, as by tying a cord N around their projecting ends,thebottom of the bag is securely closed, and when it is desired to emptythe bags it is only necessary to untie the fastening N, when the mouth Kwill gap open, per- .mitting the accumulated fumes, &c., to fall into acar or barrel, (indicated at 0.)

Among the advantages of my new construction I will note the following:i/Vhen it is desired to empty the fn mes which have collected in thebag, it may be done, without stopping the operation of the device, bysimply tying a cord around the upper part of the bag as, for instance,at a point marked in Fig. 2. This having been done the bottom of the bagis opened and the dust contained permitted to run out, then securelyfastened back again, and the string removed, none of the gases and fumesbeing permitted to escape during,

this operation. As the mouth of the bag can be placed in or immediatelyabove the barrel or car 0, the contents will be dumped without loss. Byremoving the bags more convenient and ready access is given to the mainitself when it is desired to clean it out; but the most importantadvantage gained lies in the fact that my new arrangement serves both todiminish the risk of an extensive fire in the main and has a safetyvalve or alarm. In case a fire occurs it serves the first purpose,because the dust and fume collected in the bags are completely removedfrom contact or communication with the dust in the pipe, and serves thesecond purpose, because when a fire actually does communicate to the bagthe bag is at once burned, and the tire thus announced in this mannerprompt measures can be taken to extinguish it.

I am aware that it is not new to use bags for collecting fumes whichdepend from conduits which bring the fumes and gases from the furnaces;but such bags have heretofore been used only as and in the same relativeposition as the bags B B, &c.; and my invention consists in using suchbags in the way described on the main delivery-pipeleading to thebag-house proper and in the place of the hoppers heretofore used on suchmains, whereby I gain the advantages above described.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In combination with a bag-house for screening the gases driven offfrom metallurgical furnaces, a main delivery-pipe H G, leading theretoand elevated above the ground, a series of thimbles J, extending down atintervals from the bottom of the delivery-pipe, and a series of fabricbags K, secured at top to thimbles J.

2. In combination with a bag-house for screening the gases driven offfrom metallurgical furnaces, a main delivery-pipe H G, leading theretoand elevated above the ground, a series of thimbles J, extending down atintervals from the bottom of the delivery-pipe, and a series of fabricbags K, secured at top to thimbles J and having bars M M secured on eachside of their depending mouths.

MALVERN W. ILES. Witnesses:

J. H. TUCKER, C. T. DYE.

